US2788960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous calcination process and apparatus therefor
Assignee: National Gypsum Co
•
Filing: 1954-01-08
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Granted: 1957-04-16
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Expires: 1974-01-08
Abstract
No abstract record available.
Inventors
- 👤 Sidney D Skinner
- 👤 Lewis H Seufert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:19
CPC Classifications
C; C04; C04B; C04B11/00; C04B11/02; C04B11/028
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
THE METHOD OF CONTINUOUSLY CALCINING GYPSUM COMPRISING THE STEPS OF GRINDING GYPSUM ROCK TO A FINENESS SUCH THAT APPOXIMATELY 85% WILL PASS THROUGH 100 MESH, CONTINUOUSLY FEEDING SAID GYPSUM TO AN INLET OF AN ELONGATE HEATING ZONE, CONVEYING SAID GYPSUM AS A SUBSTANTIALLY DRY MASS GENERALLY LENGTHWISE OF SAID ZONE, CONVEYING SAID GYPSUM BY ONLY AN INDIRECTLY HEATING MECHANICAL MOTIVE FORCE WITHIN THE BODY OF SAID GYPSUM, SIMULTANEOUSLY ADDITIONALLY INDIRECTLY HEATING THE MOVING BODY
Claim 2
Independent Claim
74 words
THE METHOD OF CONTINUOUSLY CALCINING GYPSUM COMPRISING THE STEPS OF GRINDING GYPSUM ROCK TO A FINENESS SUCH THAT APPOXIMATELY 85% WILL PASS THROUGH 100 MESH, CONTINUOUSLY FEEDING SAID GYPSUM TO AN INLET OF AN ELONGATE HEATING ZONE, CONVEYING SAID GYPSUM AS A SUBSTANTIALLY DRY MASS GENERALLY LENGTHWISE OF SAID ZONE, CONVEYING SAID GYPSUM BY ONLY AN INDIRECTLY HEATING MECHANICAL MOTIVE FORCE WITHIN THE BODY OF SAID GYPSUM, SIMULTANEOUSLY ADDITIONALLY INDIRECTLY HEATING THE MOVING BODY
References Cited (Backward Citations)
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US1746294A
Cited
US2247221A
Cited
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Cited
US2235311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |